neck, who introduces himself as Rear Admiral John Crayshaw. He allows them to take Anne with them, but tells the soldiers to send the ambulance away when it arrives. Meanwhile, the Doctor goes to Stanchion House, and introduces himself as 'Sir John Smith, Scientific Advisor to the Admiralty' with his psychic paper. He glances quickly at the visitor's book, and says that he has come to see V. Swann. The lift operator brings him to the correct floor, and watches until he goes in. He talks to Vida Swann for a minute before she mentions that her PC had told her Sergeant Jodie North had come in, and that she had alerted security when she saw him instead. The Doctor runs out of her office, and realizes there were soldiers coming up the stairs and the lift, and no time to get out a window, so he hides in a cupboard until the soldiers pass, then slips into the lift before the doors close. He uses a sonic screwdriver to open the hidden controls, and goes to the lowest level. The doors open into an underground hangar. The Doctor is noticed by a scientist named Huntley, and after looking at a section of the ship, the Doctor says that it was sliced up using hydrogen fused anti-cellularisation. Alarms start to go off, soldiers come down the lift, and the Doctor takes off for a room labelled 'Decontamination.' He runs through it into a damp, dirty and dingily lit access corridor. After closing the doors behind him, he notices the salty reek to the air. As he moves down the corridor, he sticks his finger in a mucky puddle and decides it is saltwater. The corridor opens into a large, dark, circular chamber with a very high ceiling and a huge filthy pool in the centre of the floor. There is a ladder on one side, and the air smells of sea water. The Doctor takes a polythene bag from his pocket and fills it with water from the pool, and then starts to climb the ladder as he hears the doors opening behind him. The ladder is damp, as if someone sopping wet had climbed up it ahead of him, and didn't dry before reaching the top. There is a barrier across the top of the chamber, but the Doctor uses his sonic screwdriver to open the inspection hatch, which